Pen



FIG. 1 is a front left view of a pen including a cap and barrel showing my new design;

FIG. 2 is a front right view of the pen shown in FIG. 1, with the cap removed and placed on the opposite end of the barrel;

FIG. 3 is a front right view of the pen as shown in FIG. 2 with the cap lifted from the barrel;

FIG. 4 is a top plan view of the pen shown in FIG. 1;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a front view thereof;

FIG. 8 is a right side view thereof; and,

FIG. 9 is a rear view thereof. 

The ornamental design for a pen, as shown and described. 